Remanufactured from Weller, the Detroit DT12OA3CD transmission delivers overdrive performance with cooler readiness and advanced double clutch control for heavy duty highway applications. Built to genuine Detroit DT12 OA overdrive A-box standards, this variant includes the capability for an oil cooler to help maintain optimal operating temperature under load. With its 12 forward speeds and automated shifting, drivers experience smoother gear changes, less fatigue, and enhanced responsiveness. Backed by Weller’s detailed remanufacturing process and strict OEM quality assurance, the DT12OA3CD helps fleets minimize downtime, extend service life, and keep performance reliable even under tough conditions.